Recently, I decided to update my Django version from 1.8.4 to 1.9.1.
This change affected the look of the buttons in my long-standing application which originally had styling done using Compass. Due to a transition from Google app engine to Heroku, I had to stop using Compass and now rely on old pre-computed CSS files.
The difference in button appearance between the old and new versions can be seen here:
Old:
https://i.sstatic.net/vdsbX.png
New (I don't like it):
https://i.sstatic.net/FUi2o.png
I am unsure why this change occurred and how to fix it despite no errors in server-side logs or Chrome debugging console. The production site displays the buttons correctly after the update, but they still look strange in my development environment.
A suggestion was made to provide a reproducible example, but my limited understanding of the issue makes it challenging. As the problem seems resolved in the live environment, I have chosen not to pursue further investigation at this time.
Although I cannot pinpoint the exact cause of the issue, I suspect it may relate to the flat styling mentioned below.
Thank you all for your assistance!